Give this Manhattan high school teacher an F for forgery — and spelling. Mona Lisa Tello was busted after she allegedly submitted a fake jury duty letter rife with bone-headed misspellings to get out of class for two weeks.

High School of Graphic Communication Arts teacher Mona Lisa Tello has been arrested after a Department of Education investigation found that she forged a spelling-error-filled fake jury duty document to take 15 paid days off in 2010 and 2011. Tello, 61, a bilingual science teacher who has been with the DOE since 1998, signed an agreement to resign on Jan. 15, and pay back $3,374.88 in salary she received for the supposed jury duty days.

It was the spelling errors in the false court document that did the Manhattan high school teacher in, according to investigators. They told the Daily News the mangled words included "trial" spelled as "trail" and "manager" spelled "manger." The teacher, Mona Lisa Tello, was arrested Monday and faces three forgery counts. Tello denied wrongdoing to local media and told the online news site DNAInfo.com that she had fallen and needed to take time off last year to recuperate. When the principal of the school refused to accept her injury report, Tello said, she was "forced" to produce a court letter to excuse her absences. But the principal at the time, Jerod Resnick, tells a different story ...

Investigators say [Mona Lisa] Tello, a teacher assigned to The High School of Graphic Communication Arts, submitted the letter to the school, claiming it was issued by a court ... The letter apparently used "trail" for trial, "sited" for cited, and "manger" for manager. The address on the letter was wrong, the telephone and fax numbers were fake, and the bar code was fake.

[Mona Lisa] Tello was arrested after the principal called the court and found out the actual letter was a deferral of jury duty, and she was charged with forgery in the second degree, criminal possession of a forged instrument in the second degree and offering a false instrument for filing in the first degree.

Her spelling was so atrocious, it was downright criminal. A veteran Manhattan educator was busted for allegedly forging a jury-duty letter with so many errors that it raised red flags when she used it to excuse more than a dozen school absences. Mona Lisa Tello, 60, a bilingual-science teacher at the HS of Graphic Communication Arts in (expletive deleted)’s Kitchen, was arrested this week on three felony counts of forgery related to her grade-A screw-up. Tello channeled an errant third-grader rather than a 13-year teaching veteran when she misspelled ... on fake letterhead ...

[School Principal] Resnick contacted a court official, who said [Mona Lisa] Tello’s jury duty had in fact been deferred. The principal then alerted Special Commissioner of Investigation Richard Condon, who reported his findings to the Manhattan District Attorney. Condon recommended Tello be terminated ...